What is the difference between 45RFE and 545RFE?

In the 45RFE applications four gears are utilized. In the 545RFE four gears are used on the upshift and a new “gear”, 2nd Prime, was used with a different (1.50:1 rather than 1.67:1) ratio to increase versatility when downshifting. Although, with some tuning, you can get the 545RFE to upshift into 2nd Prime.

How many speeds is a 45RFE transmission?

The 45RFE automatic transmission had three planetary gear sets instead of the two usually used in a four-speed automatic; that would, in time, allow it to become a six-speed.

What does 45RFE stand for?

Dubbed the 45RFE, the name indicated it had four forward speeds, a relative torque rating of 5, was intended for rear (and four) wheel drive applications, and featured full electronic control.

How many quarts does a 45RFE transmission hold?

[*]8 quarts of ATF+4 tranny fluid.

Is the 545RFE a good transmission?

it’s a fairly reliable transmission, although it can stand to be tuned for better performance. its good to around 400-450 horsepower before you would need to upgrade it. just do your normal maintenance on it and you should be fine as long as you own it.

What years did dodge use the 545RFE transmission?

The 545RFE is found in a wide variety of truck and SUV applications from 2001 to 2012 with Jeep Grand Cherokee and Jeep Commander models sporting the higher output Hemi engines. This trans can also be found in Dodge Durango models from this time period.

How much torque can the 66RFE handle?

660 ft-lbs
Looks like 660 ft-lbs of torque is what it can handle.

What is the gear ratio of a 4L60E?

The main hiccup on the 4L60E is its gear ratios – 3.06 in first and 1.62 in second, which meant you were getting a massive amount of torque in first gear, before dropping down to about half that power in second. Third gear, of course, is at 1:1, and the fourth is reserved for overdrive.

Is the 68RFE a good transmission?

The 68RFE is a well-designed and strong transmission with gear splits suited to the normal load-moving tasks faced by heavy-duty Ram diesel pickups. But it’s not strong enough to handle the high-output Cummins if one is towing at or near the maximum rating of a Ram 3500 day in and day out.

Who makes the 545RFE transmission?

Chrysler
But back in 1998, Chrysler has introduced the 45RFE in the 1999 WJ Jeep Grand Cherokee. This transmission was paired remarkably well with the 4.7 L PowerTech V8 engine. The ’45’ refers to its torque rating, i.e., ‘5,’ while ‘4’ represents the number of forward gears.